Where is the ABS ECU?

I'm troubleshooting rear left abs-sensor circuit, but I can't find the ABS-box... It should be in the enginebay, right...?

It is built inside the ABS valve block as far as I know. Did you check for short wires? Ist quite common that either the cables inside the plug Connections near to the Wheel fail or that the cables get rubbed and develop a short.

Just starting to check,
...but the Connection is above the rear end cradle... Do I need to take the rear end down?
I have code 14, left rear sensor short or open Circuit...